Pulp-vat and the like



R. E. WAGNER.

PULP VAT AND THE LIKE.

APPLlcATloN FILED Aua.9.192o.

UNITED STATES PATENT OFFICE.

RUDOLF ERNST WAGNER, F XABLSTAD, SWEDEN, ASSIGNOR TO AKTIEBOLAGET XLBLSTADS HEKANISKA 'V'EBXSTAD, OF KARLSTAD, SWEDEN, A. MANUFAC- TUBING COMPANY or SWEDEN.

PULP-VAT AND THE LIKE.

Applieuattion led August 9, 1920. Serial No. 402,377.

To all whom 'it may concern.'

Be it known that I, RUDOLF ERNST WAG- NER, a subject of the King of Sweden, re-

siding at Karlstad, in the Kingdom of Sweden, have invented a new and useful Improvement in Iul -Vats and the like, for vwhich I havev file applications in Sweden Mar. 18, 1919,. 1267/19; vNorway June 22, 1920, #20,648; Finland June 22, 1920; Germany June 25, 1920; Austria June 26, 1920, and of which the followin is a specification. Vats for gathering cel ulose, wood-pulp, and the like are previously known in which the pulp is gathered by means of a strainer cylinder rotating in the ulp, and on the surface of which the pu p settles while the water strains or filters through the cylinder, aided by suction, if desired. It has also been proposed in such vats to use a press or couch roll bearing against the str ainer cylinder for removing the web of material gathered or collected on the strainer cylinder. The present invention consists in this that one or more press -rolls is or are combined with the strainer cylinder and bearing a inst the same, said press rolls being provided with peripheral grooves, notches, deep slots, or the like. In this manner -an` increased extraction of the water from the web of material is attained, as no collection of water will be formed at the pressing place -in front of the press rolls, but the water -will be absorbed in and removed by the slots in the rolls. As apresult a higher pressure may be used without risk of crushing the webof material.

In the accompanying drawing, Figure 1.

' -showsdiagrammatically a' section of an embodiment of the invention. Fi 2 shows a portiony of a longitudinal section through the strainer cylinder and the press roll at the pressing place.

. In the embodiment illustrated, 1 denotes the strainer cylinder which rotates around a stationary suction bo the strainer cylinder consists of course of strainer or filter cloth, and thecylinder is l l divided between its surface and the suction sure to be used than that possib x 2. The surface of the strainer cloth into the cells. When the* cells have been moved a certain distance upward in the pulp container, the water collected in the cells will be drained oil` through the opening 5 of the outlet chamber 6. When the cells have moved a further distance upward .in the pul container they are sub ected to suction lforom the suction box 2 t rough its opening 7 said suction continuing while the cells are moved out of .the pulp container during the rotation of the strainer cylinder. The fiber layer gathered on the strainer cylinder is stillv subjected to vsuctionl and during this period it `arrives to the press roll 8 pressing against it may flow oiit' from the under side of said roll down into the drain trough 10. Scrapers 11 project into the slots 9 in the surface of the roll and cleanse said slots from water and from particles of pulp which may have penetrated into the same. The water pressed out thus being able to flow off from both sides of the pulp web at the pressing place, there will be formed no collection of water in front of the press roll, a result which will of course in itself entail a better pressing out of the water, and also enables a higher prese with a smooth roll, without danger of thefber web being crushed. In the embodiment illustrated there is a second press roll 12 arranged and operating in the same manner as' the press roll 8. H

.I claim: In a pulp-vat and the like, the combination of a rotary strainer cylinder for gathering the pulp, and a press roller bearing against said cylinder and provided with peripheral grooves, notches, deep slots, or the like, for the purpose of rendering ossible an increased 'ressin out of theV p p sheet gathered on t e strainer c linder.

RUDOLF ERNEST WAGNER. 

